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RE: Level3 (3356/3549) changes routing policy
From: "Siegel, David" <Dave.Siegel () level3 com>
Date: Thu, 2 Aug 2012 13:53:38 +0000

Thanks David, you hit the nail on the head on both points. 

Level 3 made the routing policy change last November, roughly 6 weeks after the acquisition of Global Crossing.


-----Original Message-----
From: David Reader [mailto:david.reader () zeninternet co uk] 
Sent: Thursday, August 02, 2012 6:41 AM
To: nanog () nanog org
Subject: Re: Level3 (3356/3549) changes routing policy

On Thu, 2 Aug 2012 10:33:38 +0200
Fredy Kuenzler <kuenzler () init7 net> wrote:

 From my observation Level3 has recently changed their routing policy. 
It seems that 3356 always prefers customer prefixes of 3549, 
regardless of the AS path length. Example (seen from 3356):


is preferred over


Considering that both 2914 and 3549 are peers of 3356, and 13030 is a 
customer of 3549, 3356 seems to give higher local-pref on the longer 
AS-path, likely to increase traffic and revenue of their sister network 3549.

Hi Fredy,

Level 3 owns both 3356 and 3549.
They're simply preferring to have their customers pay them, rather than a 3rd party.

I don't think it's suprising at all that they're doing it. If, as you think, it's only happened recently then what is 
suprising is that it didn't happen sooner IMO.


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